System Management Intel® 5000 Series Chipsets Server Board Family Datasheet
Revision 1.1
Intel order number D38960-004
134
4.27.3 IPMB LUN Routing
The BMC can receive either request or response IPMB messages. The treatment of these
messages depends on the destination logical unit number (LUN) in the IPMB message. For
IPMB request messages, the destination LUN is the responder’s LUN. For IPMB response
messages, the destination LUN is the requester’s LUN. The disposition of these messages is
described in the following table. The BMC accepts LUN 00b and LUN 10b.
IPMB messages can be up to 36 bytes, including IPMB header and checksums.
Table 44. BMC IPMB LUN Routing
LUN Name Message Disposition
00b BMC Request messages with this LUN are passed to the BMC command handler for execution.
Response messages with this LUN are compared with outstanding BMC originated requests. If
there is a match, the BMC sub-system that sent the request is notified. Otherwise the message
is discarded.
01b Reserved Reserved – All messages arriving with this LUN are discarded.
10b SMS All messages arriving with this destination LUN are placed in the Receive Message Queue. If
that buffer is full, the message is discarded. No further processing or response is done.
11b Reserved Reserved – All messages arriving with this LUN are discarded.
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